Funny Beak Markings

Hi everyone ?! I bought this beautiful baby boy about 2 weeks ago and I absolutely adore him.

In the last couple of days I have noticed these strange brown-blackish markings on his beak. He has been pruning himself like mad everyday (I have sprayed him and my aviary for mites and lice) and when I took this photo today I discovered he's also scratching at his beak. I'm nervous but I'm hoping it's just a bruise as he's always harassing one of my older males (No serious harm but every now and then the but beaks ? ) In google-fashion upon doing a search a bunch of horrifying things come up. I heard that it could be a lack of vegetables which is a possibility as the rest of the birds in my aviary reject most vegetables (except for carrots) so I don't put some out every day. As you can see in some of the pictures I was desperately trying to get him to eat some carrot but he wasn't interested. Any ideas/advice/people with past experience?

I ran my fingers gently over his beak and there's no lumps or bumps